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Genetic Diversity, Character Association and Path Coefficient Analysis of Exotic Rice Genotypes (oryza Sativa L.)

A. A. Mamun
Agrotechnology Discipline, Khulna University, Khulna 9208, Bangladesh.

N. A. Ivy
Department of Genetics and Plant Breeding,Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. G. Rasul
Department of Genetics and Plant Breeding,Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. A. K. Mian
Department of Genetics and Plant Breeding,Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. M. Hossain
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

Fifty exotic rice genotypes along with two check varieties were studied to measure the variability among the genotypes for yield and yield contributing characters, estimate genetic parameters, association among the characters and their contribution to yield. High genotypic co-efficient of variation (GCV) was observed for days to 50% flowering, days to first flowering and spikelet sterility whereas low genotypic co-efficient of variation (GCV) was observed for grain length and filled grains per panicle. High heritability with high genetic advance in percent of mean was observed for days to 50% flowering and pollen sterility indicated that this trait was under additive gene control and selection for genetic improvement for this trait would be effective. On the other hand, high heritability with low genetic advance in percent of mean was observed in days to harvesting and grain length which indicated that nonadditive gene effects were involved for the expression of this character and selection for such trait might not be rewarding. Correlation studies revealed that highest significant positive association of grain yield was with days to first flowering, days to harvesting, filled grains per panicle followed by grain length at genotypic and phenotypic level. Path co-efficient analysis revealed that maximum direct contribution towards grain yield with days to harvesting followed by filled grains per panicle.

Keywords: Rice (Oryza sativa L.), Genetic diversity, Character association, Path coefficient.

Location: Experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur

Start Date: 00-12-2008

End Date: 00-05-2009

Program Area: Variety and Species

Commodity: Rice

Objectives:

The present investigation was undertaken to assess the genetic diversity among the genotypes and to search suitable diverse germplasm as suitable donor parents for the utilization in future breeding program.

Methodology:

Fifty exotic genotypes and two varieties of rice, collected from Department of Genetics and Plant Breeding of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur namely: RG-BU-08-051, RG-BU-08-052, RG-BU-08-053, RG-BU-08-054, RG-BU-08-055, RG-BU-08-056, RG-BU-08-057, RG-BU-08-058, RGBU- 08-059, RG-BU-08-060, RG-BU-08-061, RG-BU-08-062, RG-BU-08-063, RG-BU- 08-064, RG-BU-08-065, RG-BU-08-066, RG-BU-08-067, RG-BU-08-068, RG-BU-08- 069, RG-BU-08-070, RG-BU-08-071, RG-BU-08-072, RG-BU-08-073, RG-BU-08-074, RG-BU-08-075, RG-BU-08-076, RG-BU-08-077, RG-BU-08-078, RG-BU-08-079, RGBU- 08-080, RG-BU-08-081, RG-BU-08-082, RG-BU-08-083, RG-BU-08-084, RG-BU- 08-085, RG-BU-08-086, RG-BU-08-087, RG-BU-08-088, RG-BU-08-089, RG-BU-08- 090, RG-BU-08-091, RG-BU-08-092, RG-BU-08-093, RG-BU-08-094, RG-BU-08-095, RG-BU-08-096, RG-BU-08-097, RG-BU-08-098, RG-BU-08-099, RG-BU-08-100, BRRI dhan28 and BRRI dhan29 were grown at the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur following randomized block design with three replications during December 2008 to May 2009. The field was divided into three blocks, the blocks were subdivided into 52 plots where genotypes were randomly assigned. The unit plot size was 12.5m × 2.5m. Each plot had two lines. Row to row and plant to plant distances were 25cm and 20cm respectively. Data were recorded for days to first flowering (DFF), days to 50% flowering (50% DF), days to harvesting (DH), pollen sterility (PS), spikelet sterility (SS), filled grains per panicle (FGP), unfilled grains per panicle (UGP), grain length (GL), grain breadth (GB) and grain yield per hill (GYH). Genotypic and phenotypic coefficients of variation were computed according to Burton (1952). The broad sense heritability (h²b) and genetic advance as percentage of means were calculated as suggested by Johnson et al. (1955). Genotypic and phenotypic correlation coefficients were calculated according to Miller et al. (1958) and path coefficient analysis was performed according to method suggested by Dewey and Lu (1959).

Source of Information: Bangladesh J. Pl. Breed. Genet, 25(1): 25-29, 2012

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

High heritability and GA was observed in 50%DF and PS along with moderate heritability with moderate genetic advance in UGP and SS suggested that these characters could be transmitted to the hybrid progeny and phenotypic selection based on these would be effective. Correlation and path coefficient analysis suggested that during selection more emphasis should be given on DH, FGP and UGP since these characters have high positive correlation and high direct effect on grain yield.

Knowledge Management: Journal